Introduction

The SS1-r safety sub-function monitors the amount of motor deceleration within specified limits. The STO safety sub-function is activated if the motor speed drops below a specified limit value. When the limit speed is exceeded, the STO safety sub-function is activated without brake application delay.

If the SS1‑r safety sub-function is activated, first the parameterized Monitoring delay (8706.9) applies. During the monitoring delay, the parameterized Maximum speed (8707.1) is monitored. Then the monitoring of the parameterized speed ramp starts.

If the Ramp monitoring parameter is set to "linear", monitoring of the linear speed ramp starts at the currently detected actual speed when the SS1‑r safety sub-function is activated. The end speed of the speed ramp is the parameterized minimum speed.

If the Ramp monitoring parameter is set to "jerk-limited", monitoring of the jerk-limited speed ramp starts at the sum of the currently detected actual speed plus the parameterized offset speed after the SS1-r safety sub-function is activated. The end speed of the speed ramp is either the parameterized minimum speed or, if larger, the parameterized offset speed.

If the limit speed of the speed ramp reaches the end speed, the parameterized final state (STO, SOS, or SLI safety sub-function) is activated.

If the Inverter control parameter is set to "active", activating the safety sub-function results in the activation of the FCB13 Application stop drive function in the inverter.

If the Inverter control parameter is set to "Not active", the inverter is not controlled.

If the Inverter control parameter is set to "Active with limiting", the stop ramp of the inverter is limited to the following values:

• Minimum value of the SSx deceleration
• Maximum value of the parameterized jerk time